Finding the Fourth Proportional to 12,997.84, 17,935.92 and 7,691.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,997.84 : 17,935.92 = 7,691.72 : x
2. Step 2: Convert to fraction form
   12,997.84/17,935.92 = 7,691.72/x
3. Step 3: Cross multiply
   12,997.84x = 17,935.92 × 7,691.72
4. Step 4: Simplify right side
   12,997.84x = 137,958,074.58
5. Step 5: Solve for x
   x = 137,958,074.58/12,997.84
6. Step 6: Final answer
   x = 10,613.92